<?php

require_once 'HTMLPurifier/Injector.php';

HTMLPurifier_ConfigSchema::define(
	'AutoFormat', 'PurifierLinkify', false, 'bool', '
<p>
  Internal auto-formatter that converts configuration directives in
  syntax <a>%Namespace.Directive</a> to links. <code>a</code> tags
  with the <code>href</code> attribute must be allowed.
  This directive has been available since 2.0.1.
</p>
');

HTMLPurifier_ConfigSchema::define(
	'AutoFormatParam', 'PurifierLinkifyDocURL', '#%s', 'string', '
<p>
  Location of configuration documentation to link to, let %s substitute
  into the configuration\'s namespace and directive names sans the percent
  sign. This directive has been available since 2.0.1.
</p>
');

/**
 * Injector that converts configuration directive syntax %Namespace.Directive
 * to links
 */
class HTMLPurifier_Injector_PurifierLinkify extends HTMLPurifier_Injector
{
	
	var $name = 'PurifierLinkify';
	var $docURL;
	var $needed = array('a' => array('href'));
	
	function prepare($config, &$context) {
		$this->docURL = $config->get('AutoFormatParam', 'PurifierLinkifyDocURL');
		return parent::prepare($config, $context);
	}
	
	function handleText(&$token) {
		if (!$this->allowsElement('a')) return;
		if (strpos($token->data, '%') === false) return;
		
		$bits = preg_split('#%([a-z0-9]+\.[a-z0-9]+)#Si', $token->data, -1, PREG_SPLIT_DELIM_CAPTURE);
		$token = array();
		
		// $i = index
		// $c = count
		// $l = is link
		for ($i = 0, $c = count($bits), $l = false; $i < $c; $i++, $l = !$l) {
			if (!$l) {
				if ($bits[$i] === '') continue;
				$token[] = new HTMLPurifier_Token_Text($bits[$i]);
			} else {
				$token[] = new HTMLPurifier_Token_Start('a',
					array('href' => str_replace('%s', $bits[$i], $this->docURL)));
				$token[] = new HTMLPurifier_Token_Text('%' . $bits[$i]);
				$token[] = new HTMLPurifier_Token_End('a');
			}
		}
		
	}
	
}

